blob: 59f0727714b49e5e6918e4d39773c5e98cd6bbe6 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <condition_variable>
namespace vespalib {
/**
* Reusable barrier with a predefined number of participants.
**/
class Barrier
{
private:
size_t _n;
std::mutex _lock;
std::condition_variable _cond;
size_t _count;
size_t _next;
public:
/**
* Create a new barrier with the given number of participants
*
* @param n number of participants
**/
Barrier(size_t n);
~Barrier();
/**
* Wait for the (n - 1) other participants to call this
* function. This function can be called multiple times.
*
* @return false if this barrier has been destroyed
**/
bool await();
/**
* Destroy this barrier, making all current and future calls to
* await return false without waiting. A barrier is tagged as
* destroyed by setting the number of participants to 0.
**/
void destroy();
};
} // namespace vespalib
|
